Design of a fuzzy servo-controller

A design method of a fuzzy servo-controller for nonlinear plants has been p resented. The proposed method is an error feedback scheme, where the contro ller also receives signals representing the plant operating points. Integra tor is used in the control loop to ensure setpoint following, low-frequency disturbance rejection, and to enhance the robustness of the closed-loop sy stem. A training scheme for the fuzzy controller is derived that minimizes the output error between a reference model and the plant. The training is c onducted off-line for a class of setpoints conforming to the normal operati ng condition of the plant. Results of simulation studies are also presented . (C) 2001 Elsevier Science BN. All rights reserved.